The positive aspects of the SKS fenders? The mounting system. The L-bracked riveted to the rear fender is superior to the separate plastic clip of the Planet Bike. And of course the SKS has the safety releases on the front fender. The negative aspect? Appearance. The SKS fenders I've had never ended up totally straight. It took time with a hair dryer and some bending to keep the front fender from twisting. the Planet Bike fenders look better. If they would just stick with a traditional mounting arrangement they'd be perfect. I don't like the rear clip, and I don't like the fact that the chainstay bridge clip doesn't have a screw hole. But they do look nice.